This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 25 |
| 5 | 65 |
| 6 | 197 |
| 7 | 571 |
| 8 | 1753 |
| 9 | 5351 |
| 10 | 16746 |
| 11 | 52626 |
| 12 | 167547 |
| 13 | 536559 |
| 14 | 1732272 |
| 15 | 5622960 |
| 16 | 18357211 |
| 17 | 60205319 |
| 18 | 198323708 |
| 19 | 655787680 |
| 20 | 2176141555 |
| 21 | 7244106347 |
| 22 | 24185285341 |
| 23 | 80960692691 |
| 24 | 271685400443 |
| 25 | 913784117809 |
| 26 | 3079889039230 |